AFS Determination of 9 Heavy Metal Elements in Leather

Sample of leather was digested with a mixed acid of HNO3 and HClO4(4+1), and the contents of As, Sb, Hg, Pb and Cd in sample solution were determined by HG-AFS; and sample was treated by ashing, and the contents of Cr, Co, Cu and Ni were determined by FAFS. The dilution mediums, reductive and working conditions of instrument were described in detail. Linear relationships between values of absorbance and mass concentration of the 9 elements found were in definite ranges. Values of detection limit (3S/N) found were 0.5 mg·kg-1 for As, Sb, Pb, Co and Ni; 0.05 mg·kg-1 for Hg, Cd and Cu; 5.0 mg·kg-1 for Cr. The proposed method was applied to the analysis of sample of leather, and values of recovery found by standard addition method were in the range of 89.2%-106%.